 

In photonic scattering media, such as paint, foam and tissue, the refractive index varies spatially causing incident waves to be scattered and absorbed [1]}, [2]}, [3]}, [4]}, [5]}, [6]}.
Understanding the transport of light in such scattering media is crucial for many application areas, such as atmospheric and climate sciences [7]}, [8]}, [9]}, [10]},
oceanography [11]}, [12]}, biophysics [13]}, [14]}, [15]}, [16]}, powder technology
[17]}, [18]}, and solid-state lighting [19]}, [20]}, [21]}, [22]}.
The transport theory describes the propagation of wave in scattering media, notably in a widely-used realistic situation like a slab in three dimensions (3D), as shown in Fig. REF (a).
The theory describes the transfer of intensity and neglects interference effects including diffraction [1]}.
For all practical purposes the transport theory is rigorous and only in exceptional cases such as the situations of very strong elastic scattering and Anderson localization of light where interference predominates, the transport shows features beyond the predictions of transport theory [2]}.
